Sync CHANGELOG.md from stable - #195337

This PR automates the synchronization of `CHANGELOG.md` from the
`stable` release branch (`flutter-3.47-candidate.0`,
[flutter#195179](flutter#195179)) to the
`master` branch for the `3.47.8` stable hotfix
([flutter#195000](flutter#195000)).

### Added `3.47.8` Changelog Entry

### [3.47.8](https://github.com/flutter/flutter/releases/tag/3.47.8)
#### Security advisory
[GHSA-frr6-h895-5pxp](GHSA-frr6-h895-5pxp):
- [dart/568000](https://dart-review.googlesource.com/c/sdk/+/568000)
Updates BoringSSL in the Dart runtime (3.13.7) to block compromised
eMudhra intermediate CA certificates.
- [dart/64696](dart-lang/sdk#64696) Updates
`dart:io` on Android 14+ to use the updatable Conscrypt APEX root
certificate store.
- Developers shipping Android, Windows, or Linux applications should
upgrade to Flutter 3.47.8 and rebuild their apps.
---
- [flutter/190235](flutter#190235)
When running flutter pub get or building desktop apps with existing or
broken plugin symlink entries, flutter_tools no longer crashes with a
PathExistsException.
- [flutter/192934](flutter#192934)
When dumping the focus tree or layer tree from flutter run on any
platform before the UI isolate finishes initializing or after teardown,
flutter_tools crashed with a null check operator exception.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [AI contribution guidelines] and understand my
responsibilities, or I am not using AI tools.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant in-code documentation (doc comments with
`///`).
- [x] If this PR introduces a new feature or capability, I created and
linked a website documentation issue or PR in [flutter/website] (or
verified none is needed).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[AI contribution guidelines]:
https://github.com/flutter/flutter/blob/main/CONTRIBUTING.ai.md
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[flutter/website]: https://github.com/flutter/website
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md